zcs 7.1.4 installer insisted on shutting down zimbra

when i reinstalled (after running ./install -u) with command

Code:

./install.sh --cluster active --platform-override

it insisted on shutting down zimbra

Code:

You appear to be installing packages on a platform different
than the platform for which they were built.
This platform is CentOS5_64
Packages found: RHEL5_64
This may or may not work.
Using packages for a platform in which they were not designed for
may result in an installation that is NOT usable. Your support
options may be limited if you choose to continue.
Install anyway? [N] y
The system will be modified. Continue? [N] y
Shutting down zimbra mail

I'm reinstalling a active cluster node while another active cluster node a and a standby node are running